T square



March 13, 1928. 1,662,490

N. o. COCHRAN T-SQUARE Filed 57Gb. 16, .1927

Inventor Attorney fill Patented Mar. 13, 1928.

UNITED STATES P A T E NT OFFICE.

NOBLE O. COCHRAN, OF MORRISVILLE, PENNSYLVANIA.

'1' SQUARE.

Application filed February 16, 1927. Serial No.'168,682.

To the attainment of the foregoing, the

invention consists in the improvement as hereinafter described and deliintely clanned.

In the drawing forming part oi this specification The figure is a perspective showing the T square constituting the preferred embodiment of my invention as properly arrz-inged relative to a drawing board, and also to an angle.

In the drawing 1 is a d 'awing board, 2 is a conventional angle, and 3 is the T square of my invention.

My novel T square comprises a head t and a stem 5 fixed with respect to the head i and extending at right angles thereto. The head t in accordance with my invention is rabbeted in the direction of its length at its inner edge and corner remote from the stem 5, as designated by G, and the stem 5 in accordance with my invention is rabbeted along one of its longtudinal edges and at one of its corners remote from the head 4,

as designated by 7.

The rabbet 6 in the head a is designed to receive one corner of an edge of the board 1, after the manner shown in the drawing, and the rabbet 7 in the stem 5 is adapted to receive and support one end of an angle after the manner illustrated.

The angle 2 is designed to be used in conjunction with the stem 5 of the T square in the manner indicated in cases where the horizontal lines of a drawing are inked first, the angle 2 being placed in the rabbet 7 for the inking of the vertical lines of the drawing. In this connection it will be understood that when relatively arranged as stated, the angle 2 will be separated by an intervening space from the paper or in other words clearance will be afforded between the surface of the paper and the angle 2, and consequently notwithstanding the horizontal lines may be wet the vertical lines may be inked without afiecting the horizontal lines. From this it follows that no delay need be entailed in inking the vertical lines after inking of the horizontal lines.

I would also have it understood that cases where the vertical lines are inked first, the

head 4 of the T square is arranged that its rabbet 6 receives one corner of the board 1,

this arrangement aflording a space or clean ance between the under side of the stem 5 and the surface of the paper on the board 1 so that horizontal lines may be inked 1'611 though the vertical lines may still be wet.

I would further have it understood that c by virtue of my novel T square character ized as described, either vertical or horizontal lines may be inked, notwithstanding nearby lines may not be dry.

it will be apparent from the foregoing that while my novel T-square is practically advantageous for the reasons stated, the said T-square is not materially increased in cost.

011 the other hand, the production of my novel T-square costs but little it any more than an ordinary ,T-square of corresponding material.

It will also be apparent -from the foregoing that notwithstanding the novel characteristics of myiniproved T-square is susceptible or being used to advantage in the same manner as an ordinary T-square.

I have explicitly described the preferred embodiment of my invention in orderto impart an exact understanriling of the said embodiment in all of its details. I do not desire, however, to be understood as limiting myself to the precise construction illus trated, my invention being defined by my appended claim within the scope of which modifications may be made without departure from my invention. For instance w ien desired the stem may be rabbeted along both of its longitudinal edges, the additional rabbet being identical with the one illustrated.

Having thus described the invention, what I claim is As a new artic e of manufacture, a T- square having a head and a stem extending at an angle to the head; the head having the lower corner of its edge for use in opposed relation to a drawing board, rabbeted to seat one corner of an edge of the board, and the stern having one of its upper longitudinal edges similarly rabbeted.

In testimony whereof I ailii: my signature.

i nonnn o. eoonnan, 

